Question

I need to know how to do this ?

Answer 1

When you add the degrees of all the angles in a triangle you should get 180

A= 5x+5
B= 90
C= 3x+5

5x + 3x = 8x
5 + 90 + 5 = 100

8x + 100 = 180 this is the equation
-100 -100
————————
8x = 80 ➡️ divide BOTH sides by 8

x = 10

Now plug 10 into angles A and C

5(10)+5= 55
3(10)+5= 35

A= 55 , B= 90 , C=35